*** How to Query a Timeclock Table for Log Out Times

Hello Experts,
I have a Timeclock table for all my employees, and I need to find out how long each employee was logged out for (NOT including the end-of-day LogOut when they go home).

TimeClock Table:

Employee       Log_In_Time                           Log_Out_Time
64                2010-03-01 17:06:29.000           2010-03-01 19:24:06.000
64                2010-03-01 19:44:05.000           2010-03-01 20:49:30.000
209              2010-03-01 17:50:59.000           2010-03-01 19:06:02.000
209              2010-03-01 19:18:19.000           2010-03-01 20:16:04.000
209              2010-03-01 20:35:44.000           2010-03-01 20:51:08.000
787              2010-03-01 17:31:34.000           2010-03-01 17:38:23.000
787              2010-03-01 17:38:32.000           2010-03-01 20:17:16.000
787              2010-03-01 20:33:44.000           2010-03-01 20:44:13.000

So basically I want to know, for each Employee, the time between their last Log_Out_Time and their next Log_In_Time .... this tells me how long they were looged out.

This logic should only apply to SAME DAY records... because the last logout record for an employee implies that it is the end of their shift and they go home.  So your logic cannot cross multiple dates.

So in the above table, Employee 209 logged out for 12 minutes (19:06 to 19:18) and for 19 minutes (20:16 to 20:35) on 3/1/10.  How can this be coded?  Ideally, your code will work on SQL 2005 as well as 2000 if possible.

My sample table includes on date 3/1/10, but the real table contains every day for the last 5 years.

Thanks for your help!!!

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Patrick MatthewsCommented:
The following appears to be working in SQL Server

SELECT t1.Employee, MAX(t2.Log_Out_Time) AS LastLogOut, t1.Log_In_Time, 
	DATEDIFF(s, MAX(t2.Log_Out_Time), t1.Log_In_Time) / 60.0 AS LoggedOutMinutes
	TimeClock t2 ON t1.Employee = t2.Employee AND t2.Log_Out_Time < t1.Log_In_Time
GROUP BY t1.Employee, t1.Log_In_Time
HAVING CONVERT(varchar, MAX(t2.Log_Out_Time), 102) = CONVERT(varchar, t1.Log_In_Time, 102)
ORDER BY t1.Employee, t1.Log_In_Time

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dunkin1969Author Commented:
Thanks Matthew!
This looks like it works perfectly.  Let me now run it against a full month's worth of data.
dunkin1969Author Commented:
Great concise code.  Thanks!!
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